Fix C++ warnings with XCode 7 compiler

Clang included with XCode 7 has a new warning that isn't handled in Boost yet.
Also fixed error using `abs` improperly with int64_t in Bond tests.

cmake/Config.cmake

@@ -44,8 +44,19 @@ message(STATUS "Boost Python Library: ${Boost_PYTHON_LIBRARY}")
 # disable Boost auto-linking
 add_definitions (-DBOOST_ALL_NO_LIB)
 
-cxx_add_compile_options(Clang -fPIC -Wall -Werror)
-cxx_add_compile_options(GNU -fPIC -Wall -Werror)
+cxx_add_compile_options(Clang
+    -fPIC
+    -Wall
+    -Werror
+    -Wno-unknown-warning-option
+    -Wno-unused-local-typedefs)
+
+cxx_add_compile_options(GNU
+    -fPIC
+    -Wall
+    -Werror
+    -Wno-unknown-warning-option
+    -Wno-unused-local-typedefs)
 
 include_directories (
     ${BOND_INCLUDE}

cpp/test/compat/compare.h

@@ -6,15 +6,15 @@ class Compare;
 inline bool Equal(double left, double right)
 {
     // http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
-    int64_t l = *(int*)&left;
+    int64_t l = *(int64_t*)&left;
     if (l < 0)
         l = 0x8000000000000000LL - l;
 
-    int64_t r = *(int*)&right;
+    int64_t r = *(int64_t*)&right;
     if (r < 0)
         r = 0x8000000000000000LL - r;
 
-    return abs(l - r) < 5;    
+    return (l - r) < 5 && (l - r) > -5;
 }
 
 

cpp/test/core/equal.h

@@ -42,15 +42,15 @@ private:
 inline bool Equal(double left, double right)
 {
     // http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
-    int64_t l = *(int*)&left;
+    int64_t l = *(int64_t*)&left;
     if (l < 0)
         l = 0x8000000000000000LL - l;
 
-    int64_t r = *(int*)&right;
+    int64_t r = *(int64_t*)&right;
     if (r < 0)
         r = 0x8000000000000000LL - r;
 
-    return abs(l - r) < 5;
+    return (l - r) < 5 && (l - r) > -5;
 }